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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/m² hr °C
kcal/m hr °C
kcal/hr °C

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Heat and Mass Transfer
The unit of Stefan Boltzmann constant is

watt/cm3 °K
watt/cm4 °K
watt/cm2 °K⁴
watt2/cm °K⁴

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Heat and Mass Transfer
The critical temperature is the temperature

Below which a gas is always liquefied
Below which a gas does not obey gas laws
Above which a gas will never liquefied
Above which a gas may explode

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Heat and Mass Transfer
The heat transfer takes place according to

Zeroth law of thermodynamics
Second law of thermodynamics
First law of thermodynamics
Kirchhoff's law

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different specific heat
Different temperatures
Different atomic structure
Different heat contents

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

None of these
(h₁.h₂.h₃)1/3
1/h₁ + 1/h₂ + 1/h₃
h₁ + h₂ + h₃

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